Load image into Gallery viewer, 6635-4165 390 AMC V8 FX Series -25cc Dish Top AMC Forged Piston Set 4.165 inch bore   COMP HEIGHT:  1.59"
Load image into Gallery viewer, 6635-4165 390 AMC V8 FX Series -25cc Dish Top AMC Forged Piston Set 4.165 inch bore   COMP HEIGHT:  1.59"
Load image into Gallery viewer, 6635-4165 390 AMC V8 FX Series -25cc Dish Top AMC Forged Piston Set 4.165 inch bore   COMP HEIGHT:  1.59"
Load image into Gallery viewer, 6635-4165 390 AMC V8 FX Series -25cc Dish Top AMC Forged Piston Set 4.165 inch bore   COMP HEIGHT:  1.59"
Load image into Gallery viewer, 6635-4165 390 AMC V8 FX Series -25cc Dish Top AMC Forged Piston Set 4.165 inch bore   COMP HEIGHT:  1.59"
Load image into Gallery viewer, 6635-4165 390 AMC V8 FX Series -25cc Dish Top AMC Forged Piston Set 4.165 inch bore   COMP HEIGHT:  1.59"
Load image into Gallery viewer, 6635-4165 390 AMC V8 FX Series -25cc Dish Top AMC Forged Piston Set 4.165 inch bore   COMP HEIGHT:  1.59"
Load image into Gallery viewer, 6635-4165 390 AMC V8 FX Series -25cc Dish Top AMC Forged Piston Set 4.165 inch bore   COMP HEIGHT:  1.59"

PART #: 1-6635-4165

6635-4165 390 AMC V8 FX Series -25cc Dish Top AMC Forged Piston Set 4.165 inch bore Pin Dia.: 1" Comp Height: 1.59"

Regular price $669.95
Sale price $669.95 Regular price
Sale Sold out
Unit price
/per 
Piston Series Option:
Piston Ring Kit Option:
Ships in 1 - 8 days

Ships in 1 - 8 days

Made in the USA

Made in the USA

Secure Payment

Secure Payment

This is a pre order item. We will ship it when it comes in stock.

390 AMC V8, FX, Comp Height: 1.59, -25cc Dish Top, PIN: ", Full-Floating or Press Fit, Ring Groove: 1/16-1/16-3/16" , Stroke: 3.574", ROD: 5.858, Approx Comp Ratio: 50cc-10.52, 54cc-10.08, 58cc-9.69


Piston Top Aprox. Comp. Ratio:

-25cc Dish Top AMC
ChamberComp Ratio
5010.52 to 1
5410.08 to 1
589.69 to 1

For accurate Comp Ratio info use the calculator below.

Engine Brand: AMC

Engine Family: AMC V8

Engine Size: 390

Cylinder Bore Size: 4.165 in , 105.708 mm

Ring Groove Width: 1/16-1/16-3/16"

Compression Height: 1.590"

Pin Diameter: 1.000"

Connecting Rod Length: 5.858"

Crankshaft Stroke: 3.574"

Cylinder Head: AMC

TDC Assembly Height: 9.235" ( Zero Deck Height )

Download Piston Instructions

 
Features: Piston Series
 

E series

 SX series  1-FX series  2-FX series  3-FX series
Broached pin oiling slots

x

x

 

 

 

Drilled, forced wrist pin oiling

 

x

x

x

x

Forged drain-back windows

x

 

 

 

 

Drilled bottom ring land intersecting oil groove drain-backs

 

x

x

x

x

Slightly larger, deeper valve reliefs than OEM

x

 

 

 

 

CNC machined valve reliefs for moderate performance heads and cam combinations

 

x

Larger, deeper CNC valve reliefs for more aggressive cylinder head and cam combinations

 

 

x

x

x

Premium Aircraft spec. 4032 low expansion alloy

x

x

x

 

 

Premium Aircraft spec. 2618 alloy

 

 

 

x

x

Blower, Turbo, NOS ready

 

x

x

x

x

Brushed piston crown

 

 

x

x

x

Turned dishs

x

x

 

 

 

Max Quench milled dishs

 

 

x

x

x

Additional CNC milling for weight reduction in non-critical areas

 

 

x

x

x

Patented “X Groove” skirt for superior cylinder and ring life

 

 

x

x

x

Thinner/shallower Ring grooves for maximum ring seal and land strength

 

 

x

x

x

Low volume contact reduction grooves    

x

x

x

2nd ring land accumulator groove prevents ring flutter    

x

x

x

3rd ring land scraper relief    

x

x

x

Oil ring groove relief reservoir    

x

x

x

Inner and outer pin boss weight reduction radiusing    

x

x

x

Tighter control of crown thickness yields consistently lighter parts    

x

x

x

Dynamic skirt milling controls skirt thickness for consistently lighter parts  

 

x

x

x

Diamond-turned high strength skirts

x

x

x

x

x

High-strength piston pins

x

x

x

x

x

Extreme Duty XR wrist pins      

 

x

Horizontal Gas Ports enhance ring seal        

x

Forged and machined in the USA

x

x

x

x

x

Piston Specs

Piston Top Aprox. Comp. Ratio:

-25cc Dish Top AMC
ChamberComp Ratio
5010.52 to 1
5410.08 to 1
589.69 to 1

For accurate Comp Ratio info use the calculator below.

Engine Brand: AMC

Engine Family: AMC V8

Engine Size: 390

Cylinder Bore Size: 4.165 in , 105.708 mm

Ring Groove Width: 1/16-1/16-3/16"

Compression Height: 1.590"

Pin Diameter: 1.000"

Connecting Rod Length: 5.858"

Crankshaft Stroke: 3.574"

Cylinder Head: AMC

TDC Assembly Height: 9.235" ( Zero Deck Height )

Download Piston Instructions

Piston Series Comparison Chart
 
Features: Piston Series
 

E series

 SX series  1-FX series  2-FX series  3-FX series
Broached pin oiling slots

x

x

 

 

 

Drilled, forced wrist pin oiling

 

x

x

x

x

Forged drain-back windows

x

 

 

 

 

Drilled bottom ring land intersecting oil groove drain-backs

 

x

x

x

x

Slightly larger, deeper valve reliefs than OEM

x

 

 

 

 

CNC machined valve reliefs for moderate performance heads and cam combinations

 

x

Larger, deeper CNC valve reliefs for more aggressive cylinder head and cam combinations

 

 

x

x

x

Premium Aircraft spec. 4032 low expansion alloy

x

x

x

 

 

Premium Aircraft spec. 2618 alloy

 

 

 

x

x

Blower, Turbo, NOS ready

 

x

x

x

x

Brushed piston crown

 

 

x

x

x

Turned dishs

x

x

 

 

 

Max Quench milled dishs

 

 

x

x

x

Additional CNC milling for weight reduction in non-critical areas

 

 

x

x

x

Patented “X Groove” skirt for superior cylinder and ring life

 

 

x

x

x

Thinner/shallower Ring grooves for maximum ring seal and land strength

 

 

x

x

x

Low volume contact reduction grooves    

x

x

x

2nd ring land accumulator groove prevents ring flutter    

x

x

x

3rd ring land scraper relief    

x

x

x

Oil ring groove relief reservoir    

x

x

x

Inner and outer pin boss weight reduction radiusing    

x

x

x

Tighter control of crown thickness yields consistently lighter parts    

x

x

x

Dynamic skirt milling controls skirt thickness for consistently lighter parts  

 

x

x

x

Diamond-turned high strength skirts

x

x

x

x

x

High-strength piston pins

x

x

x

x

x

Extreme Duty XR wrist pins      

 

x

Horizontal Gas Ports enhance ring seal        

x

Forged and machined in the USA

x

x

x

x

x

Engine Power TV

The DSS FX, X-Groove Feature